Vampire/ sybille/ ange name of that book ?

[Camille]

Hello

I've been looking for the name of this book for several years. I hope someone can find it with my summary.

The main character learns she is a Sybil: This is the central element of the plot. The heroine discovers her identity as a prophetess, a power she was unaware of.

Female Point of View: The story is told in the first person, through the heroine's eyes.

Ancient Vampire Who Paints: One of the main characters is an ancient vampire, who bonds with the heroine and is an artist.

Love Triangle with an "Angel": Another character, often described with divine or angelic traits, competes with the vampire for the heroine's affection.

• Tone and Format: The book is a single novel or 2/3 volumes with a dark tone and a plot that focuses on relationships and self-discovery, without major action scenes.

Thanks